Potassium, like sodium, is one of the main minerals of the body. Unlike sodium, it is found chiefly within cells rather than between them. It plays a critical role in muscular contraction, especially in the heart.
There are two problems with potassium levels among patients with chronic renal failure. One is too little, and the other is too much (medically known as hyperkaliemia). Excessive potassium is a much more common and dangerous problem than potassium deficiency, so let's look at it first.
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